Xgravity is a program for the simulation of 3D
gravitational motion of n-bodies. It reads a file
with the current state of the bodies, and displays
the motion. It features a nice isometric
perspective, Red-Green stereographics, and a
stereographic perspective which allows you to see
the trace in "real" 3D. There is a GTK GUI
interface in development, which gives you the
ability to perform basic operations with the
system, like modifing objects, rotating,
eliminating drift, and launching a simulation.

COSMIX is a general purpose N body integrator. It allows simulation of the behavior of gravitational systems according to different physical theories. The current release is only a test release - it only supports the newtonian approximation. The project aims at tackling relativity in coming releases.

Astro Info is an astronomical ephemeris/almanac for PalmOS. It displays some basic information useful to stargazers, such as rise, trans, and set times, coordinates, magnitude and phase information for Sun, Moon, and the other 8 planets and stars. It can display a view of the sky (with stars, the Sun, Moon, and planets positioned) at arbitrary times and locations. You can also search for objects based on their names and see where they are.

graph2d generates images of two dimensional graphs.
It can be used to draw graphs of functions, taking some
image parameters like the type, sizes, left, right, top,
bottom borders, scales for x and y axis, legends, title,
and two arrays and draws the graph of a function.

Astro::FITS::HdrTrans translates instrument-specific
FITS headers into generic ones. It is easily extensible to
new instruments, as one only needs to write translation
methods (or, even more simply, add values and keys to a
hash for one-to-one translations).

UFOClock draws an astronomical clock. From it you
can read the time of day, phase of the lunar
month, ratio of day to night, time until a
solstice or equinox, and time until the end or
beginning of twilight. The time of day depends on
your location on the surface of the Earth, which
you can enter on the command line or in a dotfile
in your home directory. Location can be given as
latitude/longitude or ZIP code. It is called UFO
clock because it sort of looks like crop circles.
It is based on Sundial by George Williams. It
requires GLUT installed to run and the NOVAS
library to build.